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Even in Western medicine (at the research stage, at least), that is not necessarily true in patients suffering from certain conditions.

There is some evidence (in the sense of evidence-based medicine) that a low-FODMAP (fermentable *saccharides) diet reduces symptoms in patients with irritable bowel syndrome. [1]

As far as vegetables go, according to one site high-FODMAP vegetables include alliums and artichokes. [2]

It is worth noting that the authors of the linked review paper caution that it is unknown whether a low-FODMAP diet may have long-term adverse effects.

[1] doi:10.2147/CEG.S86798

[2] https://www.monashfodmap.com/about-fodmap-and-ibs/high-and-l...